Root diseases often occur in leguminous vegetables: bean blight, bean root rot, and cowpea wilt. 1 Blight of bean wilting disease bean bean blight only harms kidney beans. When the plants become infected, when symptoms reach the flowering stage, the symptoms gradually show up. After onset, the leaves turned yellow from bottom to top, veins turned brown, and finally dried off. The roots of the diseased plants were discolored, the vascular bundle on the affected side became dark, and the cortex rotted. 2 Root rot of common bean Bean bean rot not only harms kidney beans, but also harms kidney beans. The disease can develop throughout the growing period, but the symptoms are obvious after flowering. In the root or rhizome of the diseased plant, reddish-brown lesions appear first. Afterwards, the lesions gradually turn black and the lesions subside. When the roots are completely damaged, the plants die and die. When the humidity is high, red mould is formed at the base of the stems. Things. The leaves of the diseased plants turn yellow and the edges are dead but do not fall off. 3 cowpea wilt disease cowpea wilt only harm cowpea, although the symptoms can be expressed throughout the reproductive period, but it is also more severe after flowering, its symptoms and bean blight similar. All three diseases are caused by a similar pathogen called Fusarium. All of them are wintering in the soil with mycelium, chlamydospores and diseased bodies. The pathogen is very saprophytic, and in the absence of the host, it can be cultivated in the soil for 2-3 years, and the root rot of the bean can be as long as 10 years. Two kinds of wilt disease can also attach to the seed coat for wintering and spread over long distances. During the growing season, pathogens invade from the wounds of the roots, natural cracks, and live in vascular bundles, leading to morbidity. The primary sources of infestation of the disease are mainly fertilized soils and soils, which are spread and spread through rainwater, irrigation water or tools. Continuous cropping will increase the amount of bacteria in the soil. It is easy to cause root disease with high temperature and rain, and the more serious the disease is, the higher the soil moisture content is. If the soil moisture content is less than 30%, even if it is infected by bacteria, it does not show or only slightly show symptoms. Low cropland, poor drainage, and weak plant growth all aggravated the development of the disease. To control these root diseases, the most important thing is to avoid continuous cropping. It is best to work with cruciferous or onion and garlic vegetables. When planting, sorghum should be cultivated, pay attention to drainage. The method of seed treatment before sowing can be referred to the prevention and treatment of bean anthracnose. In order to reduce the bacteria in the soil, 70% thiophanate-methyl wettable powder can be used to mix 25 kg of dry soil with 1 to 1.25 kg/mu of mu into the colonization hole after mixing. It is also possible to use 70% thiophanate-methyl 1000-fold, 50% carbendazim wettable powder 600-fold, 20% chlorhexidine-phosphate 1200-fold, and 10% double-effect water repellent 250 times. After the liquid is infiltrated, cover the soil again. When the disease is found in the field, the diseased seedlings and diseased soil should be removed and the diseased point should be disinfected with vegetation ash or lime. In the initial stage of onset of spraying, the agents used were: 70% thiophanate-methyl wettable powder 1000 times, 50% carbendazim wettable powder 600 times, 70% dexamethasone wettable powder 1000 times, 75 % of chlorothalonil wettable powder 600 times, 77% can kill particles of 700 times and so on. Spray once every 7-10 days, even spray 2-3 times, focusing on the roots.
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